Thread-guide.



J. R. MITCHELL.

THREAD GUIDE. APPLICATION FILED 11110.19, 1911.

Patented June 18, 1912.

a aw 6J1 0% T FFTQ THREAD-GUIDE.

Specification of Letters Patent.

Application filed December 19, 1911.

Patented June 18, 1912.

Serial No. 666,700.

To all whom it may concern Be it known that 1, JOHN R. MITCHELL, a citizen of the United States, and resident of Montclair, Essex county, State of New Jersey, have invented certain new and useful Improvements in Thread-Guides, of which the following is a specification.

This invention relates to improvements in thread guides of the character which are employed in thread spooling or twisting machines. Such guides as heretofore constructed have included thread passages having a cross sectional form adapted to permit only relatively slight lateral vibration of the thread passing therethrough. That is, the rear face of the thread passage against which the thread bears in passing through the guide has generally been either slightly concaved or so narrow in the direction of the length of the block, or the bar of the machine to which the block is secured, that the thread practically traveled in a groove the diameter of which was but slightly greater than that of the thread. The guides are commonly made of porcelain to provide as smooth a surface as possible and reduce the friction between the guide and thread to a minimum. However there isnecessarily some friction and this, when the thread passage is of the shape above referred to so that only a relatively small surface on the guide is constantly in contact with the thread, in a comparatively short time, will wear away the smooth surface of the guide and cause a breaking of the thread passing therethrough. This is particularly true of the guides on a wet twisting machine. A wet thread more readily collects minute particles of grit and exerts a greater amount of friction, or wear, on such a guide than a dry thread.

The object of the present invention is to provide a thread guide that is particularly designed and adapted for wet twisting machines,'and which will be practically superior to the forms of guides previously employed.

In the accompanying drawing, Figure l is a plan view of a thread guide constructed in accordance with the invention; Fig. 2 is a front elevation of the guide, the securing bolts shown in Fig. 1 being removed; Fig. 3 is a vertical sectional view, on the line 33 of Fig. 1 looking toward the front face of the guide block; Fig. 4 is a transverse sectional View taken substantially on the lines 44 of Figs. 1 and 2; Fig. 5 is a horizontal sectional, or plan, view on the line 55 of Fig. 2.

Referring to the drawing it will be seen that the body of the guide is an elongated block A commonly made of porcelain and shown as provided with two passages a; for the reception of bolts B by which the guide is secured to the supporting bar of the twisting or spinning machine to which it is applied. Through the block extends a thread guide passage C which has a vertical flat rear face 0 and end walls 0 which are inclined slightly toward each other from the rear toward the front of the block. The end walls 0 terminate in overlapping hook-like or grooved sections D which together extend across the front end of the thread passage and close the same except for a diagonally extending slot that separates the members D and extends continuously in a substantially straight line from the top to the bottom of the block.

It will be seen that the adjacent overlapping surfaces of the members D are parallel throughout their length so that the slot formed thereby which, as before noted, is substantially the-same length as the thickness of the block, is of uniform width from end to end.

The front face or surface of the block is provided with a recess, the side walls of which lead to the aforesaid slot between the hook-like members D and are preferably of the curved contour shown.

From the drawing, and particularly by reference to Figs. 1, 2 and 5, it will be seen that the thread passage 0 is elongated in the direction of the length of the block and presents a maximum extent of flat surface over which the thread passes. This is, as hereinbefore noted, of great practical importance when the thread is wet as the relatively large rear surface 0 of the passage permits the thread to vibrate freely laterally, or in the direction of length of the guide block and thus reduces materially the wear upon any particular portion of the surface of the block and avoids the danger of the thread breaking or being out while passing through the guide. The particular form and arrangement of the hook-like members D is also of importance. It will be noticed that the members D each extend substantially the full length of the thread passage so that they constitute in effect overlapping flanges at the mouth'of said passage. This particular construction is more durable and much stronger than the forms of hooks which have been heretofore emloyed on guides of this character. The fact that the hook-like members are, as it were, positioned at the inner end of a recess formed in the face of the guide block, also serves to protect these members from damage in case the front of the guide is struck as by a brush or otherwise when cleaning the machine. The relatively narrow, straight, inclined slot permits the thread to be readily Withdrawn when properly manipulated while the hook-like members D effectually prevent accidental or unintentional escape of the thread from the guide while being twisted. i

Having thus described the invention, what is claimed and desired to be secured by Letters-Patent is,

A thread guide consisting of a block having an elongated narrow slot arranged diagonally across one face and extending a substantial distance into said block, and a cross slot at the bottom of said first-mentioned slot extending straight across said block from the ends of said diagonal slot.

V In testimony whereof I affix my signature in presence of two Witnesses.

J OHN R. MITCHELL.

lVitnesses JOSEPH MGGRAW, DOROTHY F. BUSHER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

